webservice oneway和新SPSite(myUrl)

Question

我对打开一个moss站点的单向web方法有一个问题(可能是因为在一个单向web方法中上下文为空)

是否可以重写此代码以删除空引用异常？(如果没有oneway属性，我就没有例外)

[SoapDocumentMethod(OneWay = true)]
        [WebMethod(Description = "TestOneWay")]
        public voidTestOneWay(string webUrl)
        {
            using (SPSite site = new SPSite(webUrl))
            {
                 ....
            }
         }

例外情况是：

[2304] Error:Object reference not set to an instance of an object.
[2304] w3wp.exe Error: 0 :
[2304StackTrace:   at System.Web.Hosting.ISAPIWorkerRequestInProc.GetAdditionalServerVar(Int32 index)
[2304]    at System.Web.Hosting.ISAPIWorkerRequestInProc.GetServerVariable(String name)
[2304]    at System.Web.HttpRequest.AddServerVariableToCollection(String name)
[2304]    at System.Web.HttpRequest.FillInServerVariablesCollection()
[2304]    at System.Web.HttpServerVarsCollection.Populate()
[2304]    at System.Web.HttpServerVarsCollection.Get(String name)
[2304]    at System.Collections.Specialized.NameValueCollection.get_Item(String name)
[2304]    at Microsoft.SharePoint.SPGlobal.CreateSPRequestAndSetIdentity(Boolean bNotGlobalAdminCode, String strUrl, Boolean bNotAddToContext, Byte[] UserToken, String userName, Boolean bIgnoreTokenTimeout, Boolean bAsAnonymous)
[2304]    at Microsoft.SharePoint.SPRequestManager.GetContextRequest(SPRequestAuthenticationMode authenticationMode)
[2304]    at Microsoft.SharePoint.Administration.SPFarm.get_RequestNoAuth()
[2304]    at Microsoft.SharePoint.SPSite.CopyUserToken(SPUserToken userToken)
[2304]    at Microsoft.SharePoint.SPSite.SPSiteConstructor(SPFarm farm, Guid applicationId, Guid contentDatabaseId, Guid siteId, SPUrlZone zone, Uri requestUri, String serverRelativeUrl, Boolean hostHeaderIsSiteName, Uri redirectUri, Pairing pairing, SPUserToken userToken)
[2304]    at Microsoft.SharePoint.SPSite..ctor(SPFarm farm, Uri requestUri, Boolean contextSite, SPUserToken userToken)
[2304]    at Microsoft.SharePoint.SPSite..ctor(String requestUrl)
[2304]    at Reply.Moss2EAI.SPHandler.GetAllFlowConfiguration(String webUrl, String flowConList)
[2304]    at Reply.Moss2EAI.EaiMossIntegration.GetMessagesFromEai(String webUrl, String listName, String applicationName)

Answer 1

我已经找到了一个解决方法来解决我的problem.Create新HttpContext。现在的问题是:这是正确的解决方案，还是有我不考虑的影响？

我用来改变上下文的方法是：

//Call this before call new SPSite()
 private static void ChangeContext(string webUrl)
        {
            Trace.TraceInformation("ChangeContext");
            HttpContext current = HttpContext.Current;
            HttpRequest request = new HttpRequest("", webUrl, "");
            HttpContext.Current = new HttpContext(request, new HttpResponse(new StringWriter(CultureInfo.CurrentCulture)));
            HttpContext.Current.User = current.User;
        }

Answer 2

我看到的唯一含义是您实际上正在使用一个新的HttpContext。

Well..duh :)

无论如何，如果你也设置了输入和输出过滤器，这将会有影响。例如，如果您正在使用具有自己的输入和输出过滤器的WebServiceExtensions (WSE)。在这种情况下，您应该将数据存储在HttpContext中(即在您的输入和输出过滤器中)并使用该过滤器。这样就可以只使用一个httpContext，而不是创建第二个，并防止将来在扩展软件时出现任何错误。

Answer 3

使用此命令将对您有效：

SPWeb web = SPContext.Current.Web